Abstract
LSVT-1701 (previously known as SAL200), is a novel, recombinantly-produced, bacteriophage-encoded lysin that specifically targets staphylococci via cell wall enzymatic hydrolysis. In vitro activities of LSVT-1701 and comparators were tested against 415 Staphylococcus aureus and coagulase-negative staphylococci (CoNS) clinical isolates expressing various resistance phenotypes. The isolates were collected worldwide from 2002 to 2019 and tested for in vitro susceptibility using broth microdilution methodology performed according to the Clinical and Laboratory Standards Institute (CLSI) guidelines. Minimum inhibitory concentration (MIC) interpretations were based on CLSI and EUCAST criteria. MIC90 for all S. aureus, methicillin-susceptible S. aureus, methicillin-resistant S. aureus, and CoNS, were 2, 2, 2 and 2 µg/ml, respectively. LSVT-1701’s activity was not adversely affected by resistance to antimicrobial comparators against this worldwide collection of S. aureus and CoNS clinical isolates. The results of this study support further clinical development of LSVT-1701 to treat staphylococcal infections, including those caused by multidrug resistance isolates.
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